2.4.1. Speed range
The use of TYPHON compressor package outside of
their operating speed range can lead to property dama-
ge or serious injuries.
The operating speed of the Blackmer compressor pac-
kage is a function of the pulley ratio choosen for those
package. See § 1.2 for details.
IMPORTANT
:
Any system providing for a compressor being driven by
a thermal motor must include a system making it possi-
ble to disengage the compressor at startup and stop of
the motor.
In all cases, the drive must make it possible :
- To maintain the compressor rotation speed during load
variations (pressure variations).
- Not to subject the compressor to sudden or insufficient
starts.
Follow the below steps to select the proper engine
speed to operate the package in the right condition :
• Identify the flow and pressure conditions wanted
from the package
• Identify the package rotational speed needed to
meet the above flow requirements, using 1,2
• Take into account the PTO gear factors to compute
the engine set speed :
• If your PTO gear box has a split, make the calcula-
tion with both gear ratio, and select the split giving
the optimal engine speed (lowest fuel consumption)
• Write down the split value and engine speed on the
truck wind shield, so that the driver has easy access
to the proper driving conditions
2.4.2 PTO shaft drive
It is mandatory to comply with the following instructions :
• The shaft must be dynamically balanced.
• Its length and its inclination must be as small as pos-
sible, see table
• The package shaft must be horizontal, with a parallel
tolerance with the P.T.O shaft of 5°.
• The drive shaft slides perfectly well during rotation.
• The jaws of the universal joints are parallel.
• Coupling flanges show no eccentricity nor warping of
the bearing surface.
• The angle formed by the universal joint and the drive
shaft must not exceed 15°.
• Belts shall be sufficiently tensioned to avoid any
slack or slide.
2.4.3 Belt / Pulley arrangements
• In order to select the right package configuration the
PTO rotational direction needs to be known.
The package must be mounted on the right side of the
truck.
To identify PTO direction and compare it with the sketch
below, look at the truck from the rear :
• If the PTO goes from right to top to left, the PTO is left
driven
• If the PTO goes from left to top to right, the PTO is right
driven
This feature will prevent power consumption on the pac-
kage when the system is not operating.
Rear
right driven PTO
Front
left driven PTO
Left package
Right package
A
Universal joint angle
0.017
1°
0.035
2°
VERY
0.052
3°
GOOD
0.070
4°
0.087
5°
0.105
6°
0.125
7°
0.141
8°
GOOD
0.158
9°
0.176
10°
0.194
11°
0.213
12°
Limit
0.231
13°
values
0.249
14°
0.268
15°
H² + W²
A=
L
Vitesse moteur
=
vit
Ratio entrai
8/21
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